I recently purchased a new valve cap for my RVs waste system and was pleasantly surprised by its effectiveness. As an automotive enthusiast, I'm no stranger to issues with waste valves, but this one has exceeded my expectations. As a result of using this product, I found that it securely fastens onto the valve, preventing any leaks or unpleasant odors from escaping. The only downside is that it can be a bit difficult to remove, but that's a small price to pay for such a reliable product. i highly recommend it to anyone in need of a new waste valve cap..